Furnace-grate.



J. & A. NIGLAUSSB. FURNACE GRATE.

APPLICATION FILED JAN. 2, 1907.

.990 766 Patented Apr. 25, 1911.

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FURNACE GRATE.

APPLICATION FILED JAN. 2, 1907.

Patented Apr. 25, 1911.

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J'ULES NTCLAUSSE AND ALBERT NIGLAUSSE, 0F PARIS, FRANCE.

FURNACE-GRAN.

Specification of Letters Patent.

Application filed January 2, 1907. Serial No. 350,429.

Zt'o all whom it may concern:

Be it known that we, Jones Nronaossn and Answer Nrcneussn, of 24 rue des Ardennes, Paris, France, engineers, have invented a new and useful Improvement in Furnace-Grates, which improvement is fully set forth in the following specification.

This invention has for its object an improved tire grate for boiler and other furnaces by the aid of which even very small fuel may be used.

The rate consists of a series of bars placed side by side and fed from a hopper at the front; the bars are given a longitudinal movement, which causes them to move forward a little by means of a transversely rotating cylinder provided with teeth or cams which act alternately or simultaneously upon the heads of the bars. These bars are in contact at their forward end and extend beneath a regulator regulating the thickness of the layer of fuel and beneath an arch which prevents combustion until the fuel has arrived at a point at which the bars become carrier bars and carry each a-series of lined or removable plates arranged in tiers, spaces being left between them for the passage of air. The rear portion of the grate entends to a cinder remover actuated by hand or mechanically.

The accompanying drawings illustrate one method of carrying out the invention;

Tn these drawings Figure 1 is a lon 'tudinal section showing a rate applie to a boiler furnacefia The rig t hand portion of Fig. 2 is a front view and the left hand portion a section on the line A A of Fig. 1.

Fig. 3 is a partial elevation to a larger scale of a complete bar and of the mechanism by which it receives motion. Fig. 3 is a similar view of the rear portion of the grate. Fig. A is an end view ofFig. 3 showing several bars. Fig. is a transverse section on the line. BB of Fig. 3*.

in the drawings the grate consists of a series of bars a resting upon two supports,- a forward support 6 and a rear support 1;.

Each bar consists at its forward en of a flat imperforate. portion d and then takes-the The fuel is distributed upon th forward.

the grate is located beneath a pass from beneath the bars up between the.

plates.

Each bar a is provided at its forward portion with two fixed lugs, an upper lug j and a lower lug is turned in the reverse direction and placed in dilferent vertical planes for example i to the left and h to the right (Figs. 2 and d). A tooth Z carried by a cylinder m/Which can be turned upon its axis, acts upon the upper lug j in such a manner as to move bar a into the position shown in dotted lines in Fig. 3. A second tooth n also carried by the cylinder m is arranged in such a manner as to push'the lug 7c and. consequently the bar a back into its original position. For this purpose each bar is formed with flat portions 0 and p which slide upon the supports 6 and 0 respectively. A grate is composed of a series of bars a laid side by side. There is thus obtained by reason of the imperforate port-ions Z a continuous surface through which air cannot pass. Below it extends a portion like the tiles of a roof formed of the plates 6 and with air passages formed between the plates. The

. overlapping plates, as shown, are approximately parallel to the general direction of the grate bar. All the bars forming this covering are submitted tot-he action of the teeth 3, Z and 'n.' These teeth are arranged in three series, Z, Z and 'n, arran d at an angle to each other. The first-series Z oper- Fatented Apr. 25, 1911.

ates the even numbered bars, the second series Z the odd numbered bars. The teeth 01 arranged in a single series which actupon all the bars simultaneouslyandare so positioned as to push all the bars directly after the second-series have been drawn forward.

In order to avoid too great a strain upon the axis of the cylinder each series of teeth may be arranged helically as shown in Figs.

portion ofthe grate by means of o e or more hoppers g and the thickness offlthe layer thusdistributed is regulated by a regulator 1* which can be raised or lowered.'-

The whole of the imperforate ortion of situated a small distance from the grate. The arch s is continued as a higher arch t.

' At the end of the grate is a cinder remover at arch 8 formed of aseries of bars u fixed to the shaft '0 which can be oscillated by the levers :11 and a combined with y, as shown in Fig. 1.

The fuel delivered by the hopper spreads itself in a uniform layer regulated by the helght of the re lator r situated at the forward portion o the grate. The cylinder m on being rotated causes the even numbered bars a to be moved forward by means of the teeth 1. The fuel however upon these bars cannot follow this movement by reason of the fuel located above it; likewise the odd numbered bars are drawn'by their teeth Z the fuel upon them being unable to move. So soon as the second series of. bars has been moved forward the teeth n push all the bars rearward. The fuel distributed then moves downward. When the bars are again drawn toward the front, the fuel finds a natural support in the fuel recently delivered by the hopper. So long as it is under the arch s the fuel can not burn for it receives no air for this purpose. When after having been subjected to a slight distillation near to the outlet from the arch s the fuel arrives upon the portion of the bars provided with air passages, it kindles, combustion being aided by the presence of the arch t. The speed of movement of the ate is regulated according to the desire speed of combustion in such a manner that the combustion may be complete at the lower endof'the grate and that the cinder remover may receive onl i as . airinto the space formed by fthe grate, by

the lower-portions of the ashpit forming walls by the ashpit itself and its door.

There 'is therefore the advantageof a blast at all parts of the grate, resultlng in a con- I tinuous cooling of all thesearts as well as a regularly controlled com ustion. When i there is an accidental excess of pressure in the furnace this arrangement avolds all chances of blowing outward.

In order to render the rear of' the grate visible from the furnace, by looking through the front of the boiler, a tube-1 is provided through'this front having at its forward end. a transparent plate 2 formed of mica for example. As the flames formed in the front of the grate are generally opaque, air

- is injected through the tube 1 when it is desired to see the back of thegr'ate. The air may be led through the pipe 3 forming a branch of that which is contained in the chamber formed between the grate and the ashpit and the lower sides of the boiler. When air is injected the flames become clear and the grate thus visible.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is:

1. A grate formed of a series of bars laid side by side, each consisting of a forward fuel supporting part through which air cannot pass, and a rear part carrying overlapping plates arranged in tiers between which air can pass, i n'combination with means for longitudinally moving all the bars simultaneously in one direction and for'simultaneously moving alternate bars in the opposite direction. 4

2. A grate consisting of a series of bars laid side by side and inclining from the front to the rear of the furnace, each bar consisting of an imperforate forward fuel supporting part through which the air cannot pass, and a rear part carrying overlap-L ping plates arranged 1n tiers between which the air can pass, in combination with means for successively imparting movement to al-' ternate bars simultaneously in one direction, and means for imparting a simultaneous longitudinal movement to all the bars in the opposite direction.

3. A grate formed of a series of bars laid side by'side, each consisting of a broad imperforate forward fuelsupporting part and a narrow rear part carrying overlappmg vertically spaced plates, the spacing between the said plates bemg varied to suit the needs of combustion at each point, the said bars arranged at an inclination side by side to form'with the forward parts a broad continuous imperforate table-like structure, and with the rear parts a series of transversely extending plates overlapping downwardly toward the rear.

4. A grate formed of a seriesof bars laid side by side, each consisting of a broad imperforate forward fuel supporting part and a narrow rear part carrylng overlapping vertically spaced plates, the spacing between the said plates being varied to suit the needs of combustion at each point, the said bars arranged at an inclination side by side to form with the forward parts a broad continuous imperforate table-like structure, and with the rear parts a series of transversely extendin plates overlapping downwardly toward t e rear, means to periodically propelthe bars forwardly alternately, and means to simultaneously propel them rearwardly. 1 4

:5. In agrate comprising a series of similarly disposed inclined grate bars, each 'having its upper forward end formed with an imperforate fuel-supporting portion, said portions together forming an imperforate table structure, the lower rear portion of each bar formed with a series of overlapping vertically spaced plates, means to simultaneously propel alternate bars forward, and means to simultaneously propel all of the bars rearwardly.

(3. In a grate comprising a series of similarly disposed inclined grate bars, each having its upper forward end formed with an imperforate fuel-supporting portion, said portions together forming an imperforate table-structure, the lower rear portion of each bar formed with a series of overlapping vertically spaced plates, a drive cylinder carrying one set of teeth correspondin in number to the grate bars and arrange in two longitudinal series, the members of each series alternating with those of the other series, and a second set arranged in a single continuous series, the teeth of the first set arranged to simultaneously engage alternate grate bars to draw them forward and the teeth of the second set to, engage all the bars simultaneously to push them back as the cylinder is rotated.

In testimony whereof we have signed this specification in the presence of two subscribing witnesses.

J ULES NICLAUSSE. ALBERT NICLAUSSE.

WVitnesses: J EAN VAUGHER, HANSON C. CoxE; 

